string ="他问,你知道cba是什么单词的缩写吗?"
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option=input("请输入股功能选项：\n")
    if option=='1':
        string =string.replace('','')
        print(string)
    elif option=='2':
        for i in string:
            if i==',':
                string=string.replace(',','，')
            elif i=='.':
                string=string.replace('.','，')
            elif i=='?':
                string=string.replace('?','？')
            elif i=='?':
                string=string.replace("'","’")
                string=string
                print(string)
    elif option =='3':
        string =string.upper()
        print(string)
    elif option =='4':
        break           

